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zeekayandHanzo Dev
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Source files keep their SPDX-License-Identifier and Hanzo copyright line; the Gitea, Gogs and LFS Test Server copyrights they used to repeat now live once in NOTICE, alongside LICENSE. The header lint accepts any copyright line above the SPDX line, so it no longer demands an upstream one. Co-authored-by: Hanzo Dev <[email protected]>
125 lines
3.6 KiB
Go
125 lines
3.6 KiB
Go
// Copyright 2026 Hanzo AI, Inc. All rights reserved.
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// SPDX-License-Identifier: MIT
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package gitdiff
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import (
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"bufio"
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"bytes"
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"fmt"
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"html/template"
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"io"
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"github.com/hanzoai/git/modules/setting"
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"github.com/alecthomas/chroma/v2"
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)
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type BlobExcerptOptions struct {
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LastLeft int
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LastRight int
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LeftIndex int
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RightIndex int
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LeftHunkSize int
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RightHunkSize int
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Direction string
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Language string
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}
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func fillExcerptLines(section *DiffSection, filePath string, reader io.Reader, lang string, idxLeft, idxRight, chunkSize int) error {
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buf := &bytes.Buffer{}
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scanner := bufio.NewScanner(reader)
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var diffLines []*DiffLine
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for line := 0; line < idxRight+chunkSize; line++ {
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if ok := scanner.Scan(); !ok {
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break
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}
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lineText := scanner.Text()
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if buf.Len()+len(lineText) < int(setting.UI.MaxDisplayFileSize) {
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buf.WriteString(lineText)
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buf.WriteByte('\n')
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}
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if line < idxRight {
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continue
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}
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diffLine := &DiffLine{
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LeftIdx: idxLeft + (line - idxRight) + 1,
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RightIdx: line + 1,
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Type: DiffLinePlain,
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Content: " " + lineText,
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}
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diffLines = append(diffLines, diffLine)
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}
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if err := scanner.Err(); err != nil {
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return fmt.Errorf("fillExcerptLines scan: %w", err)
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}
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section.Lines = diffLines
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// DiffLinePlain always uses right lines
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section.highlightedRightLines.value = highlightCodeLines(filePath, lang, []*DiffSection{section}, false /* right */, buf.Bytes())
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return nil
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}
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func BuildBlobExcerptDiffSection(filePath string, reader io.Reader, opts BlobExcerptOptions) (*DiffSection, error) {
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lastLeft, lastRight, idxLeft, idxRight := opts.LastLeft, opts.LastRight, opts.LeftIndex, opts.RightIndex
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leftHunkSize, rightHunkSize, direction := opts.LeftHunkSize, opts.RightHunkSize, opts.Direction
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language := opts.Language
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chunkSize := BlobExcerptChunkSize
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section := &DiffSection{
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language: &diffVarMutable[string]{value: language},
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highlightLexer: &diffVarMutable[chroma.Lexer]{},
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highlightedLeftLines: &diffVarMutable[map[int]template.HTML]{},
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highlightedRightLines: &diffVarMutable[map[int]template.HTML]{},
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FileName: filePath,
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}
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var err error
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if direction == "up" && (idxLeft-lastLeft) > chunkSize {
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idxLeft -= chunkSize
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idxRight -= chunkSize
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leftHunkSize += chunkSize
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rightHunkSize += chunkSize
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err = fillExcerptLines(section, filePath, reader, language, idxLeft-1, idxRight-1, chunkSize)
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} else if direction == "down" && (idxLeft-lastLeft) > chunkSize {
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err = fillExcerptLines(section, filePath, reader, language, lastLeft, lastRight, chunkSize)
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lastLeft += chunkSize
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lastRight += chunkSize
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} else {
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offset := -1
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if direction == "down" {
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offset = 0
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}
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err = fillExcerptLines(section, filePath, reader, language, lastLeft, lastRight, idxRight-lastRight+offset)
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leftHunkSize = 0
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rightHunkSize = 0
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idxLeft = lastLeft
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idxRight = lastRight
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}
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if err != nil {
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return nil, err
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}
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newLineSection := &DiffLine{
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Type: DiffLineSection,
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SectionInfo: &DiffLineSectionInfo{
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language: &diffVarMutable[string]{value: opts.Language},
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Path: filePath,
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LastLeftIdx: lastLeft,
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LastRightIdx: lastRight,
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LeftIdx: idxLeft,
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RightIdx: idxRight,
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LeftHunkSize: leftHunkSize,
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RightHunkSize: rightHunkSize,
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},
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}
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if newLineSection.GetExpandDirection() != "" {
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newLineSection.Content = fmt.Sprintf("@@ -%d,%d +%d,%d @@\n", idxLeft, leftHunkSize, idxRight, rightHunkSize)
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switch direction {
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case "up":
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section.Lines = append([]*DiffLine{newLineSection}, section.Lines...)
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case "down":
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section.Lines = append(section.Lines, newLineSection)
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}
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}
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return section, nil
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}
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